# NDA (National Defense Academy) Mathematics: Questions 246 - 253 of 384

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## Question number: 246

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Appeared in Year: 2012

MCQ▾

### Question

The geometric mean and harmonic mean of two non-negative observations are and respectively. Then what is the arithmetic mean of the observation equal to?

### Choices

Choice (4)Response

a.

4

b.

25

c.

12.5

d.

9

## Question number: 247

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Appeared in Year: 2012

MCQ▾

### Question

What is the mode for the data 20,20,20,21,21,21,21,2122,22,22,22,22,22,22,23,23,23,23,24,24,25?

### Choices

Choice (4)Response

a.

7

b.

21

c.

25

d.

22

## Question number: 248

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MCQ▾

### Question

If and then what is equal to?

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 249

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Appeared in Year: 2012

MCQ▾

### Question

What is the sum of the squares of the roots of the equation

### Choices

Choice (4)Response

a.

270

b.

422

c.

327

d.

424

## Question number: 250

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MCQ▾

### Question

What is the value of

### Choices

Choice (4)Response

a.

3

b.

2

c.

7

d.

1

## Question number: 251

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MCQ▾

### Question

What is the angle subtended by pole at a distance on the ground in sexagesimal measure?

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 252

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Appeared in Year: 2012

MCQ▾

### Question

What is the cosine of angle between the planes and

### Choices

Choice (4)Response

a.

b.

c.

d.

All of the above

## Question number: 253

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MCQ▾

### Question

What is the number of ways that boys and girls can be seated so that boys and girls alternate?

### Choices

Choice (4)Response

a.

120

b.

14,400

c.

12

d.

72

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